; 
; 
: 
) 
; 
; 
Botany and Zoology. 429 
with Ostrea subtrigonalis Evans and Shumard, also Melania, Paludina, 
and other. fresh-water shells, Corbula subtrigonalis, C. perundata.—/ort 
Clark, Corbula mactriformis (associated with Melania, Paludina, ete.,) 
Bulimus Limneiformis, B. Nebrascensis, Paludina multilineata, P. pecu- 
liaris—Little Horn River, Planorbis couvolutus—Yellow-Stone River, 
30 miles above the mouth, Melania Anthonyi—Vear headwaters of Little 
Missouri, Cerithium Nebrascencis. | , 
III. BOTANY AND ZOOLOGY. 
1. Alph. DeCandolle: Géographie Botanique raisonnée, ou Exposition 
des Faites principaux et des Lois concernant la Distribution Géograph- 
igue des Plantes de U Hpoque Actuelle. Paris and Geneva, 2 vols. 8vo, 
1855.—Pressing engagements have prevented the fulfilment of our prom- 
ise to make a detailed examination of this work. We exceedingly regret 
this; for the Géographie Botanique of DeCandolle is not only one of the 
most important works of our day, but one which addresses and will 
greatly interest, a much broader circle of scientific readers than any 
other modern production of a botanical author. It is, and probably long 
will be, the standard treatise upon a wide class of questions, highly and 
almost equally interesting to the botanist, the zoologist, the geologist, the 
2 
Bs some. 
aes of the work, and involves occasional repetitions ; but it would not 
easy to collocate well and clearly so vast an amount of materials in 
any better way. Pee : 
The first Book is occupied with some preliminary considerations upon 
the way in which temperature, light, and moisture act upon plants. Its 
three chapters treat of the relations of plants to surrounding physical 
conditions, and especially to heat and light ; and contain the author's 
‘ ~ 
